Html 选择 C#

发布于 2024-10-16 06:40:32 字数 375 浏览 1 评论 0原文

我的源代码中有多个如下所示的元素。

<a  id="thread_title_158922" href="#"></a>

问题是我不知道标题后面的数字。所以我尝试了这个语法：

        HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
        doc.LoadHtml(code);
        var items = doc.DocumentNode.SelectNodes("//a[@id='thread_title_*]");

但它不起作用。有解决办法吗？

原文

I have multiple elements in the sourcecode which look like this.

<a  id="thread_title_158922" href="#"></a>

The problem is that i don't know the number behind title.
So i tried this syntax:

        HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
        doc.LoadHtml(code);
        var items = doc.DocumentNode.SelectNodes("//a[@id='thread_title_*]");

But it's not working. Is there a solution for this?

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小红帽 2024-10-23 06:40:32

这有效（经过测试）：

HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(code);
var items = doc.DocumentNode
               .SelectNodes("//a[starts-with(@id,'thread_title_')]");

编辑：

在删除之前我查看了其他答案 - 我认为应该也有效（或者我是这么认为的）：

var items = doc.DocumentNode
               .SelectNodes("//a[@id='thread_title_*']"); //returs null

经过一番研究，发现 HtmAgilityPack 中对属性的 XPath 支持不支持正则表达式，但您可以使用诸如 starts-with、contains、translate 等函数、substring-before 和 substring-after。只是一个需要注意的问题。

This works (tested):

HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(code);
var items = doc.DocumentNode
               .SelectNodes("//a[starts-with(@id,'thread_title_')]");

Edit:

I looked at the other answer before it was removed - and in my opinion that should have worked as well (or so I thought):

var items = doc.DocumentNode
               .SelectNodes("//a[@id='thread_title_*']"); //returs null

After some research it turns out that the XPath support in HtmAgilityPack for attributes does not support regular expressions but you can use functions such as starts-with, contains, translate, substring-before and substring-after. Just a gotcha to be aware of.

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